package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import java.util.Collections;
import java.util.concurrent.TimeUnit;



public class SimpleRedisLock implements ILock {

    private StringRedisTemplate stringRedisTemplate;

    private String name;

    public SimpleRedisLock(StringRedisTemplate stringRedisTemplate, String name) {
        this.stringRedisTemplate = stringRedisTemplate;
        this.name = name;
    }

    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID().toString(true)+"-";
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;
    static {
        UNLOCK_SCRIPT = new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unLock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }


    @Override
    public boolean tryLock(long timeoutSec) {
        String threadId = ID_PREFIX + Thread.currentThread().getId();
        Boolean success = stringRedisTemplate.opsForValue().setIfAbsent(name + KEY_PREFIX, threadId, timeoutSec, TimeUnit.SECONDS);

        return Boolean.TRUE.equals(success);
    }



    @Override
    public void unLock() {
        stringRedisTemplate.execute(
                UNLOCK_SCRIPT,
                Collections.singletonList(KEY_PREFIX + name),
                ID_PREFIX + Thread.currentThread().getId()
        );
    }



    /*@Override
    public void unLock() {
        String threadId = ID_PREFIX + Thread.currentThread().getId();
        String lock = stringRedisTemplate.opsForValue().get(name + KEY_PREFIX);
        if (threadId.equals(lock)) {
            stringRedisTemplate.delete(ID_PREFIX + name);
        }

    }*/
}
